Graphical user interface for a display screen



FIG. 1 is a front view of the graphical user interface for a display screen, shown without the display screen for ease of illustration; and,

FIG. 2 is an additional front view of the graphical user interface with the display screen shown in broken lines.

The broken lines in the drawings illustrate the unclaimed portions of the graphical user interface and the unclaimed display screen and form no part of the claimed design. 

We claim the ornamental design for a graphical user interface for a display screen, as shown and described. 